JP2016075782A - Optical fiber cable and method for laying optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber cable etc. that does not impair aesthetic appearance in a room and excels in the work efficiency of laying.SOLUTION: An optical fiber cable 1 is composed of a coated optical fiber 3, a tension member 7, and a jacket 11, etc. The coated optical fiber 3 is comprised of a glass optical fiber and a resin coated part, the outer circumference of the coated optical fiber 3 is further coated with a transparent member 5. Urethane acrylate, PVC, nylon, etc., for example, may be adopted for the transparent member 5. It is preferable that the total light transmittance of the transparent member 5, as stipulated under JIS K7361-1, is 60% or more. This is because if the total light transmittance is less than 60%, the coated optical fiber 3 (transparent member 5) increases in hue and becomes conspicuous. It is more preferable that the total light transmittance of the transparent member 5 is 80% or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical fiber cable or the like that is not noticeable when laid indoors.

  Usually, an indoor cable is used when drawing an optical fiber cable indoors. An indoor cable is connected to an indoor optical line terminator, and is connected to each optical device using a LAN cable or the like.

  As such an optical fiber cable, for example, it has a tension member, an optical fiber core wire provided between the tension members, and a jacket that collectively wraps them, and the outer circumference of the jacket is along the longitudinal direction. There is an optical fiber cable provided with one or more cable sheath notches (Patent Document 1).

JP 2008-65038 A

  However, if the indoor cable is laid in the room, the indoor cable may be conspicuous and the indoor aesthetics may be impaired. Further, when laying indoors using an optical cord or the like, it is necessary to connect the optical cord and the indoor cable.

  The present invention has been made in view of such a problem, and an object thereof is to provide an optical fiber cable or the like that does not impair the aesthetics of the room and is excellent in laying workability.

  In order to achieve the above-described object, the first invention provides an optical fiber core, a tension member provided on both sides of the optical fiber core in a cross section perpendicular to the longitudinal direction, the tension member, and the optical fiber core. A first jacket that is provided so as to cover the wire, and the optical fiber core wire is covered with a transparent member.

  The transparent member preferably has a total light transmittance of 60% or more as defined in JIS K7361-1.

  An indoor cable is constituted by the first outer cover, and the indoor cable is built in by a second outer cover provided so as to cover the indoor cable and a support line disposed on a side of the indoor cable. A drop cable may be configured.

  The first jacket has a size of 1.6 mm × 2.0 mm, the transparent member has an outer diameter of 0.9 mm, and the tension member has a diameter of 0.25 mm to 0.3 mm. It may be made of wire or poly-paraphenylene benzobisoxazole fiber reinforced plastic.

  A cross-sectional shape of the tension member may be a substantially rectangular shape, and the tension member may be disposed so as to sandwich the optical fiber core wire on the long side of the tension member.

  A flat part may be formed in at least a part of a cross section perpendicular to the longitudinal direction of the transparent member.

  The outer diameter of the optical fiber core wire from which the transparent member has been removed may be 0.25 mm.

  According to the first invention, since the optical fiber core wire is covered with the transparent member, it is difficult to impair the aesthetic appearance when wiring in the room. For example, colored optical fibers are used as optical fiber cores in order to distinguish between optical fiber cores and improve visibility. However, in the present invention, the optical fiber core wires are made of transparent members with no coloring. Is coated. Therefore, since the optical fiber core wire is composed of the transparent member, the transparent glass element wire, and the resin coating, the optical fiber core wire does not stand out.

  In particular, if the total light transmittance is 60% or more, the effect is great.

  Further, by taking out only the optical fiber core covered with the transparent member and wiring it in the room, the connection between the optical fiber core and the indoor cable including the jacket can be omitted.

  Furthermore, the connection part of a drop cable and an indoor cable can also be abbreviate | omitted by comprising the drop cable which incorporates the indoor cable containing an optical fiber core wire.

  Here, as described above, conventionally, the outermost periphery of the optical fiber core was colored in order to improve the visibility, but in the present invention, since the whole is transparent, the visibility at the time of work is high. May be inferior. Therefore, increasing the optical fiber core diameter can increase visibility and improve workability. Further, since the mechanical characteristics are improved by increasing the diameter of the optical fiber core, it is suitable for the work of wiring the optical fiber core. For example, by setting the outer diameter to 0.9 mm, workability and mechanical characteristics are improved, and conventionally used optical connection members and the like can be used.

  On the other hand, when the size of the jacket is 1.6 mm × 2.0 mm, the outer diameter of the optical fiber coated with the transparent member is larger than that of the conventional one, so that it is difficult to dispose the tension member. Therefore, in the present invention, in order to reduce the outer diameter of the tension member and to obtain the same allowable tension as in the prior art, the tension member is a steel wire or poly-paraphenylene benzo having a diameter of 0.25 mm to 0.3 mm. It can also be made of bisoxazole fiber reinforced plastic. By doing in this way, it becomes possible to apply the optical fiber core wire which has a transparent member, ensuring the jacket size and allowable tension equivalent to the past.

  In addition, since the cross-sectional shape perpendicular to the longitudinal direction of the tension member is made substantially rectangular, the cross-sectional area of the tension member can be increased by placing the optical fiber core wire between the long sides of the tension member, In addition to obtaining the same effect as described above, the bending rigidity of the cable is increased, and the push-in line into the pipe line is facilitated.

  If a flat part is formed in at least a part of the cross section perpendicular to the longitudinal direction of the transparent member, the work of bonding to a wall or the like becomes easy.

  Moreover, if the optical fiber core wire diameter after removing the transparent member is 0.25 mm, a conventional optical connector or the like can be used.

  A second invention uses an indoor cable and an optical fiber core, and the indoor cable contains the optical fiber core, and in a cross section perpendicular to the longitudinal direction, on both sides of the optical fiber core. A tension member provided, and a first jacket provided so as to cover the tension member and the optical fiber core, the optical fiber core being covered with a transparent member, An indoor cable is disposed at a site penetrating indoors from the inside of the building, and the first jacket of the indoor cable and the tension member are removed in the indoor of the building, the optical fiber core wire is taken out, and the optical fiber core wire is removed. Is connected to an optical line termination device.

  A drop cable having a second outer cover provided therein so as to cover the indoor cable and a support wire disposed on a side of the indoor cable in a cross section perpendicular to the longitudinal direction, which includes the indoor cable; In use, outside the building, the second jacket of the drop cable and the support wire may be removed, the indoor cable may be taken out, and the taken out indoor cable may be disposed.

  According to the second invention, since the optical fiber core in the room is transparent, the aesthetic appearance in the room is not impaired. Moreover, the connection part of an optical fiber core wire and an indoor cable can be reduced. Furthermore, if the drop cable incorporates the indoor cable, the connecting portion between the indoor cable and the drop cable can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the optical fiber cable etc. which are excellent in laying workability | operativity without impairing the indoor aesthetics can be provided.

1 is a cross-sectional view of an optical fiber cable 1. FIG. The conceptual diagram which shows the optical fiber cable laying method 20. FIG. Sectional drawing of the optical fiber cable 1a. Sectional drawing of the optical fiber cable 1b. Sectional drawing of the optical fiber cable 1c. (A) is sectional drawing of the optical fiber cable 1d, (b) is sectional drawing of the optical fiber cable 1e.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the optical fiber cable 1. The optical fiber cable 1 includes an optical fiber core wire 3, a tension member 7, a jacket 11 and the like.

  The optical fiber core wire 3 and the tension member 7 are integrated by a jacket 11. For example, a polyolefin material imparted with flame retardancy, low friction properties, and weather resistance can be applied to the jacket 11.

  Notches 9 are formed on the upper and lower surfaces of the outer cover 11 of the optical fiber core wire 3 (outer peripheral surfaces in a direction perpendicular to the direction in which the tension member 7 is provided) at positions facing each other. When the jacket 11 is broken from the upper and lower notches 9 with a cable dividing tool, a nipper or the like, the inner optical fiber core wire 3 (transparent member 5) can be separated from the tension member 7 and the jacket 11 and taken out. . That is, the transparent member 5 and the outer cover 11 are not in close contact.

  The optical fiber core wire 3 is composed of a glass strand and a resin coating portion, and the outer peripheral portion thereof is covered with a transparent member 5. As the optical fiber core 3 excluding the transparent member 5, for example, a conventional optical fiber core having a diameter of 0.25 mm can be applied. By doing in this way, after taking out the optical fiber core wire 3, if only the transparent member 5 is removed as needed, it can be handled as a conventional optical fiber core wire.

  For the transparent member 5, for example, a thermoplastic resin such as PVC, styrene elastomer, fluorine rubber, silicone rubber, polycarbonate, nylon, urethane, polyester elastomer, low molecular polyethylene, or ultraviolet curable resin such as urethane acrylate can be applied. As for the transparent member 5, it is desirable that the total light transmittance prescribed | regulated by JISK7361-1 is 60% or more. This is because when the total light transmittance is less than 60%, the color of the optical fiber core wire 3 (transparent member 5) becomes strong and stands out. More preferably, the total light transmittance of the transparent member 5 is 80% or more.

  The outer diameter of the optical fiber core wire 3 (transparent member 5) is preferably 0.5 mm or 0.9 mm, for example. If the outer diameter is 0.5 mm or 0.9 mm, a connector or the like used for a conventional optical fiber can be used. In addition, since all the optical fiber core wires 3 are made of a transparent material, the visibility is poor as compared with a conventionally used optical fiber core wire (having a colored layer on the outer periphery), so that workability is deteriorated. . Moreover, since the outer diameter of the optical fiber core wire 3 is 0.25 mm, the mechanical strength is weak and it is necessary to perform wiring carefully. Therefore, in the present invention, it is desirable that the outer diameter is 0.9 mm. Moreover, it can also be set as an outer diameter of 0.9 mm or more as needed.

  A pair of tension members 7 are provided on both sides of the optical fiber core 3 so as to be separated from the optical fiber core 3. The tension member 7 may be a conventional galvanized steel wire, monofilament such as PEN or PET, aramid fiber, glass fiber, fiber reinforced plastic made of PBO (poly-paraphenylene benzobisoxazole) fiber, or the like. it can.

  Here, as shown in FIG. 1, it is desirable that the optical fiber cable 1 has the same size and shape as a commonly used indoor cable. That is, it is desirable that the size of the outer jacket 11 be 2.0 mm × 3.1 mm or 1.6 mm × 2.0 mm. By doing in this way, the conventionally used connector and holding member can be used as they are.

  When the size of the optical fiber cable 1 is 1.6 mm × 2.0 mm, if the outer diameter of the transparent member 5 is 0.9 mm, it is difficult to arrange the tension member 7 having a diameter of 0.5 mm. In this case, it is desirable that the outer diameter of the tension member 7 is about 0.25 mm to 0.3 mm. In this case, the tension member 7 is made of steel wire or PBO fiber reinforced plastic, so that the same allowable tension as in the prior art can be secured.

  Thus, in the present invention, the outer diameter of the tension member 7 is made larger than that of the optical fiber core wire 3 (transparent member 5) in order to ensure the workability by enlarging the optical fiber core wire 3 (transparent member 5). It is desirable to make it smaller.

  Next, an optical fiber cable laying method using the optical fiber cable 1 will be described. FIG. 2 is a conceptual diagram showing an optical fiber cable laying method 20. In the outdoors, a drop cable is used up to the optical cabinet 19 in the building (A in the figure), and the drop cable and the indoor cable are connected in the optical cabinet 19. The indoor cable is laid from the outside of the building to the indoor optical outlet 13 (B in the figure). From the optical outlet 13 to the optical line terminator 15 (C in the figure), the optical fiber core wire 3 having the transparent member 5 is laid. Note that the optical line terminator 15 is connected to an optical equipment 17 such as a personal computer by a LAN cable or the like.

  In the present embodiment, the optical fiber cable 1 can be applied between the optical cabinet 19 and the optical line terminator 15 (B and C in the figure). In this case, first, the optical fiber cable 1 (indoor cable) is connected to the drop cable and laid in the wall. In the optical outlet 13, the jacket 11 and the tension member 7 of the optical fiber cable 1 are removed, the transparent member 5 is exposed, and the optical fiber core wire 3 having the transparent member 5 is taken out. Further, the optical fiber core wire 3 is wired and connected to the optical line termination device 15. Thus, the laying work is completed.

  In the present invention, since the indoor cable is not laid directly up to the optical line terminating device 15 as in the prior art, the indoor cable is not wired indoors. For this reason, the indoor aesthetics are not impaired. Moreover, since the optical fiber core wire 3 is covered with the transparent member 5, it does not stand out even indoors.

  As described above, according to the present embodiment, the indoor cable or the like is not exposed in the room, and the optical fiber core wire 3 is also covered with the transparent member 5, so that the aesthetic appearance in the room is not impaired. Moreover, in the optical outlet 13, since it is not necessary to provide a connection between indoor cables or a connection portion between the indoor cable and the optical fiber core wire, the laying workability is excellent.

Conventionally, it is not considered that the optical fiber cable is laid so that only the optical fiber core wire 3 is exposed in the room, and an indoor cable, a LAN cable, or the like has been used. On the other hand, in the present invention, there is a novel idea that the space up to the indoor optical line terminator 15 is constituted by only the optical fiber core wire 3 is not present in the past.
Further, even if indoor wiring is performed only with the optical fiber core wire 3, the conventional colored core wire is detrimental to the appearance and needs to be cautiously wired. , Mechanical strength is improved. Moreover, since the outer diameter of the optical fiber core wire 3 is increased by the transparent member 5, it is excellent in visibility and handleability.

  Moreover, since such an optical fiber core wire 3 is built in an indoor cable, the connection part of an indoor cable and the optical fiber core wire 3 becomes unnecessary. For this reason, the connection work at the time of laying can also be omitted. Moreover, since the optical outlet 13 should just be able to hold | maintain an indoor cable and a core wire, it can be reduced in size compared with what accommodates the conventional connector etc. For this reason, the indoor aesthetics can be further improved.

  In addition, since it is difficult to lay the optical fiber core wire 3 in the wall, all of B and C in the figure cannot be configured by the optical fiber core wire 3 alone. Therefore, it is necessary to use an indoor cable (or drop cable) in the wall. For this reason, conventionally, an indoor cable has been laid in a room as it is. The present invention can achieve both laying workability and aesthetic retention by incorporating the optical fiber core wire 3 coated with the transparent member 5 in the indoor cable.

  Next, a second embodiment will be described. FIG. 3 is a diagram showing the optical fiber cable 1a. In the following description, the same functions as those of the optical fiber cable 1 and the like are denoted by the same reference numerals as those in FIG.

  The optical fiber cable 1 a has substantially the same configuration as the optical fiber cable 1, but is different in that it has a support line 21. A support wire portion is connected to a cable portion where the optical fiber core wire 3 is provided. A support line 21 is provided in the support line portion. The support line 21 is for supporting the optical fiber cable 1a when the optical fiber cable 1a is laid. For the support wire 21, for example, a galvanized steel wire can be used. That is, the optical fiber cable 1a is used as a drop cable.

  Next, an optical fiber cable laying method using the optical fiber cable 1a will be described. In FIG. 2, the optical fiber cable 1a is laid as a drop cable from the outside to the optical outlet 13 (A and B in the figure), and the optical fiber core covered with the transparent member 5 is from the optical outlet 13 to the optical line terminator 15. Lay only line 3. In this case, it is not necessary to connect the drop cable and the indoor cable in the optical cabinet 19.

  As described above, also in the second embodiment, the same effect as that in the first embodiment can be obtained. That is, the optical fiber cable of the present invention can be applied to both an indoor cable and a drop cable.

  Next, a third embodiment will be described. FIG. 4 is a diagram showing the optical fiber cable 1b. The optical fiber cable 1b has substantially the same configuration as the optical fiber cable 1a, but differs in that an indoor cable is built therein.

  A support wire 21 is disposed on the side of the optical fiber cable 1 (indoor cable) described above. In this state, the jacket 11 a (second jacket) is covered so as to cover the jacket 11 (first jacket) and the support wire 21 of the optical fiber cable 1. That is, a drop cable is constituted by the jacket 11a.

  On the outer periphery of the outer cover 11a, notches 9a are provided at positions facing each other. When the jacket 11a is broken from the upper and lower notches 9a with a cable dividing tool or the like, the inner optical fiber cable 1 can be separated from the support line 21 and the jacket 11a and taken out. That is, the outer cover 11 and the outer cover 11a are brought into contact with each other with no adhesion or weak adhesion.

  Next, an optical fiber cable laying method using the optical fiber cable 1b will be described. In FIG. 2, an optical fiber cable 1b is laid with a drop cable from the outside to the optical outlet 13 (A in the figure). Between the optical cabinet 19 and the optical outlet 13 (B in the figure), only the optical fiber cable 1 is taken out from the optical fiber cable 1b and installed. Further, only the optical fiber core 3 covered with the transparent member 5 is laid from the optical outlet 13 to the optical line terminator 15. In this case, it is not necessary to connect the drop cable and the indoor cable in the optical cabinet 19. Moreover, since an indoor cable should just be laid in the wall, workability | operativity is also good.

  As described above, also in the third embodiment, the same effect as that in the first embodiment can be obtained. Further, an optical connection portion such as a connector is not required between the outdoor drop cable and the indoor optical line termination device 15.

  Next, a fourth embodiment will be described. FIG. 5 is a diagram showing the optical fiber cable 1c. The optical fiber cable 1c has substantially the same configuration as the optical fiber cable 1, but the shape of the tension member 7 is different.

  In the optical fiber cable 1c, the cross-sectional shape perpendicular to the longitudinal direction of the tension member 7 is substantially rectangular. As described above, in the present invention, since the outer diameter of the optical fiber core wire 3 needs to be increased by the transparent member 5, it is necessary to downsize the tension member 7 when applied to a small-sized indoor cable or the like. There is. On the other hand, when the cross-sectional area of the tension member 7 is reduced, it is necessary to select a material having higher strength.

  In the present embodiment, the tension member 7 has a substantially rectangular cross-sectional shape, and the tension member 7 is arranged so that its short side faces in the vertical direction. In other words, the optical fiber core wire 3 is sandwiched between the long sides of the tension member 7. By doing in this way, the dimension which the width direction of the tension member 7 arrange | positioned at the both sides of the optical fiber core wire 3 (along direction of a tension member) occupies can be restrained small. In addition, a sufficient cross-sectional area can be ensured.

  In this case, as a material of the tension member 7, a rectangular wire JIS G3502 piano wire or JIS G3506 hard steel wire can be used.

  According to the fourth embodiment, an effect similar to that of the first embodiment can be obtained. Further, even in a small indoor cable, the tension member 7 can be arranged to increase the secondary moment of section, and it is easy to pass through while pushing directly into the pipe.

  Next, a fifth embodiment will be described. FIG. 6A shows an optical fiber cable 1d. The optical fiber cable 1d has substantially the same configuration as the optical fiber cable 1, but the cross-sectional shape of the transparent member 5 is different.

  The transparent member 5 of the optical fiber cable 1d has a cross-sectional shape perpendicular to the longitudinal direction that is not a circle but a substantially rectangle. That is, in the cross section, the flat portion 23 is formed on at least a part of the outer peripheral surface of the transparent member 5 (in the case of a rectangle, each of the four surfaces becomes the flat portion 23).

  Thus, when the flat part 23 is formed in the outer peripheral surface of the transparent member 5, when adhering to a wall surface etc. in a room | chamber interior, the flat part 23 can be utilized as an adhesive surface. Therefore, the transparent member 5 can be easily bonded to the wall surface or the like as compared with the case of a circular cross section.

  The cross-sectional shape of the transparent member 5 does not have to be substantially square as illustrated, but may be a rectangle or a trapezoid. Moreover, as long as the flat part 23 can be formed, the optical fiber cable 1e as shown in FIG.6 (b) may be sufficient. The transparent member 5 of the optical fiber cable 1e has a shape in which a part of a circular cross-sectional shape is cut off, and a flat portion 23 is formed in part. Thus, in this embodiment, the flat part 23 should just be formed in at least one part regardless of whether the cross-sectional shape of the transparent member 5 is substantially rectangular or substantially circular.

  According to the fifth embodiment, an effect similar to that of the first embodiment can be obtained. Further, it is easy to bond the transparent member 5 (optical fiber core wire 3) to a wall or the like. Note that the transparent member 5 having the flat portion 23 as shown in FIGS. 6A and 6B may be applied to the optical fiber cables 1a, 1b, and 1c shown in FIGS. Good.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c ......... Optical fiber cable 3 ... Optical fiber core wire 5 ... Transparent member 7 ... Tension member 9, 9a ... Notch 11, 11a ... Outer sheath 13 ... ... Optical outlet 15 ... ... Optical line termination device 17 ... Optical equipment 19 ... Optical cabinet 20 ... Optical fiber cable laying method 21 ... Support line 23 ... Flat part

Claims (9)

An optical fiber core,
In a cross section perpendicular to the longitudinal direction, tension members provided on both sides of the optical fiber core;
A first jacket provided to cover the tension member and the optical fiber core;
Comprising
The optical fiber cable is coated with a transparent member.   The optical fiber cable according to claim 1, wherein the transparent member has a total light transmittance of 60% or more as defined in JIS K7361-1. An indoor cable is constituted by the first jacket,
The drop cable incorporating the indoor cable is configured by a second jacket provided so as to cover the indoor cable and a support line disposed on a side of the indoor cable. An optical fiber cable according to claim 1 or 2.   The first jacket has a size of 1.6 mm × 2.0 mm, the transparent member has an outer diameter of 0.9 mm, and the tension member has a diameter of 0.25 mm to 0.3 mm. 3. An optical fiber cable according to claim 1 or 2, wherein the optical fiber cable is made of wire or poly-paraphenylene benzobisoxazole fiber reinforced plastic.   2. The cross-sectional shape perpendicular to the longitudinal direction of the tension member is substantially rectangular, and the tension member is disposed so as to sandwich the optical fiber core wire on the long side of the tension member. Or the optical fiber cable of Claim 2.   The optical fiber cable according to any one of claims 1 to 5, wherein a flat portion is formed in at least a part of a cross section perpendicular to the longitudinal direction of the transparent member.   The optical fiber cable according to any one of claims 1 to 6, wherein an outer diameter of the optical fiber core wire from which the transparent member is removed is 0.25 mm. Using indoor cables and optical fiber cores,
The indoor cable incorporates the optical fiber core, and covers a tension member provided on both sides of the optical fiber core in a cross section perpendicular to the longitudinal direction, and the tension member and the optical fiber core. A first jacket provided,
The optical fiber core wire is covered with a transparent member,
An indoor cable is installed in the part that penetrates the building from the outside to the inside,
Inside the building, remove the first jacket of the indoor cable and the tension member, take out the optical fiber core,
An optical fiber cable laying method comprising connecting the optical fiber core wire to an optical line terminator. A drop cable having a second outer cover provided therein so as to cover the indoor cable and a support wire disposed on a side of the indoor cable in a cross section perpendicular to the longitudinal direction, which includes the indoor cable; Use
Outside the building, the second jacket of the drop cable and the support wire are removed, and the indoor cable is taken out,
9. The optical fiber cable laying method according to claim 8, wherein the taken-out indoor cable is disposed.

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